Ouch! Illustrations by Icons8 - Professional, perfectly matching, and customizable illustrations for any designs
IconStore - Free icon packs by first-class designers
Control Illustrations - 108 free flat illustrations with customizable characters
omg-img - Insert icons directly into your HTML just by coding
Humaaans - Mix-&-match illustrations of humans with a design library.
Mosaic - Mosaic provides brands with solutions to store and categorize their digital graphic and photography files for quick and easy retrieval.